I'm looking to build shelves beside my fireplace but need to trim my mantel width down to accomodate them.
I have access to a circular saw, a reciprocating saw and a jig saw. I could also get a router if needed.
This is from a diy website but they had this part done by a professional. I'm just curious how you would go about cutting this. What tools should I use?
That looks like it might be a separate molding around the edge, mitered at the corner? See if you can figure out how it's attached—you may be able to pry off the portion that would be running front-to-back in the photo without damaging anything, then cut off the mitered corner on the left-to-right length with a handsaw..
If it's edging on a solid slab, pick whichever power saw you think is most likely to cut through in one pass and set up a guide to make sure the cut is straight, that's all I can say.